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        pre{color:green;padding:10px 15px;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;}
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<pre>
&lt;script type="text/javascript"&gt;
    var i = iResult = 0
    function sum()
    {
        for (var i = 0; i < arguments.length; i++)
        {
            iResult += arguments[i]
        }
        return iResult
    }
    <span>//应用</span>
    alert(sum(1,2,3,4,5,6,7,8,9,10)) <span>//输出55</span>
&lt;/script&gt;
</pre>
<script type="text/javascript">
    var i = iResult = 0
    function sum()
    {
        for (var i = 0; i < arguments.length; i++)
        {
            iResult += arguments[i]
        }
        return iResult
    }
    //应用
    alert(sum(1,2,3,4,5,6,7,8,9,10))
</script>
</body>
</html>